Traxxas 3728A Lower Chassis 166mm

This is the genuine Traxxas lower chassis with the 166mm-long battery compartment, which accepts both flat and hump style battery packs.

The lower chassis is the backbone of the truck. Every suspension mount, the transmission, the electronics, and the battery all bolt to it, so its condition sets the baseline for how the whole car handles.

Chassis damage tends to be gradual: stress cracks form around the suspension mounts and battery compartment after repeated hard landings, and a tweaked chassis will never track straight regardless of how carefully the suspension is set up. A fresh chassis restores a true, square foundation.

The 166mm battery compartment is the useful spec here, taking either flat or hump packs without modification when switching between NiMH and LiPo. This is a direct factory replacement. Package includes one lower chassis.